[Devel] Re: [PATCH v5 13/14] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs

[Andrew Morton]

On Tue, 16 Oct 2012 14:16:50 +0400
Glauber Costa <glommer at parallels.com> wrote:

> @@ -146,7 +146,7 @@ void __weak arch_release_thread_info(struct thread_info *ti)
>  static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
>  						  int node)
>  {
> -	struct page *page = alloc_pages_node(node, THREADINFO_GFP,
> +	struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,
>  					     THREAD_SIZE_ORDER);

yay, we actually used all this code for something ;)

I don't think we really saw a comprehensive list of what else the kmem
controller will be used for, but I believe that all other envisaged
applications will require slab accounting, yes?


So it appears that all we have at present is a
yet-another-fork-bomb-preventer, but one which requires that the
culprit be in a container?  That's reasonable, given your
hosted-environment scenario.  It's unclear (to me) that we should merge
all this code for only this feature.  Again, it would be good to have a
clear listing of and plan for other applications of this code.